Miles per gallon?

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CHOKE: With the car cold, work the throttle once and see if the choke plate snaps fully closed. After the car has run a few seconds look down the carb throat, and see that the choke plate is open about 1/8 of an inch. Afters about 5 minutes, see if the choek plate is open. If not, pull out the choke mechanism and look for a small nut and screwdriver adjustment with the markings 'R' and 'L' for rich and lean. Adjust a bit to L to see if the car is helped...

Try this first.